There are a number of good reasons to build your own personal computer. The one reason left out of this discussion more than anything is the "control" aspect. Everyone wants to have as much control over how their electronics work as much as possible. Fan controller software is cool, no pun intended, but there is nothing like a physical interface. The Fractal Design Adjust 108 fan controller gives me control over the fans in my PC individually. Let's see how well it does at this task!